An electronic differential speed control circuit for driving the inboard and outboard A.C. wheel motors at different relative speeds depending upon the steering angle during a turn. An electrical circuit for sensing the torque of the tractor's wheel motors to maintain a constant implement draft. A hollow tubular axle pivots around the tractor's longitudinal material-transferring tunnel to conserve space and permit mounting of the wheel motors within the axle. The tunnel has two material-transfer...

Warpage-free spectacles comprised of plastic lenses and plastic frames wherein the frames are constructed of materials having the same or lower tensile elastic modulus and/or the same coefficient of thermal expansion as the lens material.

A tractor assembly for mounting on a track fixed to a workpiece the tractor used to support and guide a metal-working tool along a fixed path, the tractor having three wheels to engage opposite edges of the track, one of said wheels being laterally displaceable to facilitate mounting of the tractor to the track. The invention also includes rest buttons or supports to facilitate alignment and mounting of the tractor and additional roller supports engageable to said track if needed.

In fuses for a sufficiently elevated circuit voltage the single breaks formed near the center of the fusible element at the occurrence of small overload currents does not produce a sufficiently high arc voltage to bring the current down to zero. In such instances it is necessary to produce series multibreaks to achieve interruption of the overloaded circuit. The present invention describes new means to produce series multibreaks. In fuses according to this invention the fusible element is subdiv...

A flower stand employs a vertical post which can be supported at its lower end by a horizontal cruciform shaped base having downwardly curved tips at the free ends thereof. The upper end of the post is threaded. A vertical hollow container open at its top end has a downwardly and inwardly tapered bottom section with a vertical threaded bore engaged by the upper end of the post. A flat perforated disc is disposed in between the top open section of the container and the bottom section and is held ...

An all season window includes a rectilinear peripherally extending pane mounting frame. Three panes of transparent material are secured sealingly within the frame in parallel spaced relationship and extend vertically. A solar heat ray absorbent material is contained within the frame. In one preferred form of the invention the middle of the three panes comprises the solar heat ray absorbent material and a discrete amount of heat absorbent liquid is included within the frame. A pump and associated...

An all purpose indexing device primarily for interrupting the motion of baking pans on a continuously moving conveyor, the baking pans having spaced indentations therein, comprising a U-shaped index bar pivotally mounted to fixed portion of the conveyor frame having a central crosspiece disposed across the conveyor, at least two indexing fingers extending downwardly from the crosspiece toward the conveyor and engagable with the indentations of a baking pan. Air cylinders are connected between th...

A steering and transmission arrangement for an off-road all-terrain vehicle provides for the drive ratios to each of the vehicle wheels to be geared up and down in unison so that each wheel receives a torque which is an average of the torque requirements of all the wheels. Steering is effected by varying the drive ratios to the left-hand and right-hand wheels differentially so that the wheels on one side are speeded up and the wheels on the other side are slowed down. The wheels are supported in...

A new and useful all plastic disposable thermometer is disclosed, which dispenses with the prior art employment of an aluminum or other metal-based substrate. The novel thermometer can either be employed with opaque indicator means or with heat-sensitive compositions of matter that change color with a change in phase, such as those enumerated in copending application Ser. No. 946,935, filed Sept. 28, 1978, now U.S. Pat. No. 4,232,552.

A collapsible carry-all cart includes a frame which is provided with side rod members that are retractable to thereby selectively collapse or extend the cart in a front to rear direction. The frame has a pair of legs with wheels mounted thereon at each side thereof. The pairs of legs are pivotable in scissor-like fashion and are slidable vertically on the frame from an extended position in which the cart is rollable on the wheels to a storage position in which the pairs of legs are shifted to an...